Pipe-thread protector.



No. 642,324. Patented Jan. 30, I900. G. H. HARVEY.

PIPE THREAD PROTECTOR.

(Application filed Aug. 1, 1898.!

(No Model.)

WITNESSES: l/VI/E/VTOR GEORGE ll. HARVEY, OF PITTSBURG, PENNSYLVANIA,ASSIGNOR TO THE NATIONAL TUBE COMPANY, OF NEW JERSEY.

PIPE-THREAD PROTECTOR.

SPECIFICATION forming part of Letters Patent No. 642,324, dated January30, 1900.

Application filed August 1, 1898.

To all whont it may concern:

Be it known that I, GEoReE I-I. HARVEY, a citizen of the United Statesof America, and a resident of Pittsburg, county of Allegheny, State ofPennsylvania, have invented certain new and useful Improvements inPipe-Couplers, of which the following is a specification.

My invention relates to couplers or threadprotectors for rods or pipes,having special use as thread-protectors to engage with the threads ofpipes or bars and protect the same from injury in handling ortransportation, its object being to provide a cheap coupling orprotector suitable for use with the larger sizes of pipe and which canbe produced at reasonable cost.

It consists, essentially, in a coupler or thread-protector having aseries of ribs on its inner face, placed at equal distances apart, andhaving screw-threads on the upper edges of such ribs.

To enable others skilled in the art to make and use myinvention, I willdescribe the same more fully, referring to the accompanying drawings, inwhich-,

Figure 1 is a perspective view of a strip from which the protectors areto be formed. Fig. 2 is an end view showing the same bent into annularform. Fig. 3 is a longitudinal section showing the same threads formedon the inner face of the ribs.

In said drawings, 1 is the flat strip of metal, having the ribs 2 formedon one face thereof, these ribs being placed at practically equaldistances apart and having open spaces 3 between the ribs. Such rolledstrip is bent into annular form, as shown in Fig. 2, its ends beingconnected together in any suitable way, the ring or annulus soproducedbeing thread- Serlal No. 687,405. (No model.)

ed in any suitable machine. The threadingdies engage only with the facesof the ribs 2, cutting the threads 4 on the same, as shown in Fig. 3,the open spaces 3 between the ribs reducing materially the cost oftapping by reducing the surface to be tapped, while such open spacesallow the taps to cool during the cutting of the thread and so extendtheir life. The coupling or protector so produced engages with thethreads of the pipe or bar at short intervals and so forms a strong andrigid coupling or protector, though of lightweight, because of the ribsformed on the body,which provide for the bracing of the same and make itpossible to form such body of lightweight, while the threads are outonly upon the ribs which engage at intervals with the threads of thepipe or bar and through the same, as Well as the bodies of the ribs,give the necessary bracing.

lVhat I claim as my invention, and desire to secure by Letters Patent,is-

1. A coupler or thread-protector formed with an annular body portionhaving a series of ribs on its inner face set at substantially equaldistances, the faces of said ribs being tapped to form screw-threads,substantially as set forth.

2. A coupler or thread-protector formed with an annular body portionhaving a series of ribs on its inner face, said ribs having screwthreadsformed thereon, substantially as set forth.

Signed by me at Pittsburg, Pennsylvania, this 30th day of July, 1898.

GEO. H. HARVEY.

Witnesses:

J. Born DUFF, EDWARD A. LAURENCE.

